GFCI - What Is It? What is a Ground Fault Circuit Interrupter, and how does it protect you?THE GFCIA "GFCI" is a ground fault circuit interrupter. A ground fault circuit interrupter is an inexpensive electrical device that, if installed in household branch circuits, could prevent over two-thirds of the approximately 300 electrocutions still occurring each year in and around the home. Installation of the device could also prevent thousands of burn and electric shock injuries each year.

The GFCI is designed to protect people from severe or fatal electric shocks Because a GFCI detects ground faults, it can also prevent some electrical fires and reduce the severity of others by interrupting the flow of electric current.GFI's are also used anywhere around water including: Kitchens, Bathrooms, Outside plugs, and Pools,Hot tubs and Spas

Easy and Safe GFCI Outlet Conversion

Older style 2-prong outlets in the home near a sink or in a bathroom can be dangerous because they are not grounded and have no means of protecting you from shock. Not only should outlets near sinks be grounded, but they should be of a type called GFCI or Ground Fault Circuit Interrupter.

However, Code allows you to replace these old outlets with a GFCI outlet if no means to ground the receptacle is available. Converting an old non-grounded 2 prong receptacle into a GFCI outlet like the photo is easy and improves your home's safety. It still won't be grounded but still provides protection from electrical shock because of the outlet's special design.

THE PROBLEMHave you ever experienced an electric shock? If you did, the shock probably happened because your hand or some other part of your body contacted a source of electrical current and your body provided a path for the electrical current to go to the ground, so that you received a shock.

An unintentional electric path between a source of current and a grounded surface is referred to as a "ground-fault." Ground faults ground-fault. Ground faults occur when current is leaking somewhere, in effect, electricity is escaping to the ground. How it leaks is very important. If your body provides a path to the ground for this leakage, you could be injured, burned, severely shocked, or electrocuted.

Some examples of accidents that underscore this hazard include the following:

- Two children, ages five and six, were electrocuted in Texas when a plugged-in hair dryer fell into the tub in which they were bathing.

- A three-year-old Kansas girl was electrocuted when she touched a faulty countertop.

These two electrocutions occurred because the electrical current escaping from the appliance traveled through the victim to ground (in these cases, the grounded plumbing fixtures). Had a GFCI been installed, these deaths would probably have been prevented because a GFCI would have sensed the current flowing to ground and would have switched off the power before the electrocution occurred.

HOW THE GFC1 WORKSIn the home's wiring system, the GFCI constantly monitors electricity flowing in a circuit, to sense any loss of current. If the current flowing through the circuit differs by a small amount from that returning, the GFCI quickly switches off power to that circuit. The GFCI interrupts power faster than a blink of an eye to prevent a lethal dose of electricity. You may receive a painful shock, but you should not be electrocuted or receive a serious shock injury.

Here's how it may work in your house.. Suppose a bare wire inside an appliance touches the metal case. The case is then charged with electricity. If you touch the appliance with one hand while the other hand is touching a grounded metal object, like a water faucet, you will receive a shock. If the appliance is plugged into an outlet protected by a GFCI, the power will be shut off before a fatal shock would occur.

AVAILABILITY OF GFCIsThree common types of ground fault circuit interrupters are available for home use:

* RECEPTACLE TYPE

This type of GFCI is used in place of the standard duplex receptacle found throughout the house It fits into the standard outlet box and protects you against "ground faults' whenever an electrical product is plugged into the outlet Most receptacle-type GFCls can be installed so that they also protect other electric-cal outlets further "down stream" in the branch circuit.

* CIRCUIT BREAKER TYPE

In homes equipped with circuit breakers rather than fuses, a circuit breaker GFCI may be installed in a panel box to give protection to selected circuits The circuit breaker GFCI serves a dual purpose - not only will it shut off electricity in the event of a "ground-fault," but it will also trip when a short circuit or an over-load occurs Protection covers the wiring and each outlet, lighting fixture, heater, etc served by the branch circuit protected by the GFCI in the panel box.

* PORTABLE TYPE

Where permanent GFCls are not practical, portable GFCls may be used One type contains the GFCI circuitry in a plastic encio-sure with plug blades in the back and receptacle slots in the f rant. It can be plugged into a receptacle, then, the electrical product is plugged into the GFCI. Another type of portable GFCI is an extension cord combined with a GFCI. It adds flexibility in using receptacles that are not protected by GFCls.

WHERE GFCIs SHOULD BE CONSIDEREDIn homes built to comply with the National Electrical Code (the Code), GFCI protection is required for most outdoor receptacles (since 1973), bathroom receptacle circuits (since 1975), garage wall outlets (since 1978), kitchen receptacles (since 1987), and all receptacles in crawl spaces and unfinished basements (since 1990).

Owners of homes that do not have GFCls installed in all those critical areas specified in the latest version of the Code should consider having them installed. For broad protection, GFCI circuit breakers may be added in many panels of older homes to replace ordinary circuit breaker. For homes protected by fuses, you are limited to receptacle or portable-type GFCIs and these may be installed in areas of greatest exposure, such as the bathroom, kitchen, basement, garage, and outdoor circuits.

A GFCI should be used whenever operating electrically powered garden equipment (mower, hedge trimmer, edger, etc.). Consumers can obtain similar protection by using GFCIs with electric tools (drills, saws, sanders, etc.) for do-it-yourself work in and around the house.

INSTALLING GFCIsCircuit breaker and receptacle-type GFCIs may be installed in your home by a qualified electrician. Receptacle-type GFCIs may be installed by knowledgeable consumers familiar with electrical wiring practices who also follow the instructions accompanying the device. When in doubt about the proper procedure, contact a qualified electrician. Do not attempt to install it yourself.

The portable GFCI requires no special knowledge or equipment to install.

TESTING THE GFCIsAll GFCIs should be tested once a month to make sure they are working properly and are protecting you from fatal shock. GFCIs should be tested after installation to make sure they are working properly and protecting the circuit.

To test the receptacle GFCI, first plug a nightlight or lamp into the outlet. The light should be on Then, press the "TEST" button on the GFCI. The GFCI's "RESET" button should pop out, and the light should go out.

If the "RESET" button pops out but the light does not go out, the GFCI has been improperly wired. Contact an electrician to correct the wiring errors.

If the "RESET" button does not pop out, the GFC1 is defective and should be replaced.

If the GFCI is functioning properly, and the lamp goes out, press the "RESET" button to restore power to the outlet.

GFCI (Ground Fault Circuit Interrupter) protection is a system that shuts down the protected electric circuit -- opens it -- when it senses an unexpected loss of power, presumably to ground. GFCI protection devices constantly monitor and compare the amount of power flowing from the panel on the hot or phase wire and the amount returning on the neutral wire. Any time the returning power drops even slightly below the amount being supplied, the protection device will trip and open the circuit.

GFCI devices work by passing both the hot wire and the neutral wire through a sensor such as a differential transformer and connecting the sensor to a solenoid or relay that opens switch contacts built into the power conductors inside the device -- in front of the transformer, of course. The schematic above (or in a larger version here) shows all of that.

You may have noticed that the working parts of a GFCI system don't include the circuit ground wire or the ground slot on a receptacle. That's because GFCIs are designed to protect us against a ground fault, which is an unintended loss of power to ground -- possibly through a person. The regular grounding system protects the equipment that is attached (or plugged in) to the circuit against a ground fault in it. GFCI devices are designed to protect people, not equipment.

When it is working properly, a GFCI device will open its protected circuit when the difference between the current coming in and the current going out reaches .005 ampere. That's 5 milliamp, an amount most of us can't even sense. Making sure it is working properly is the reason for testing it once a month.

Note: sometimes GFCI is called GFI.

When and where do you need Ground Fault Circuit Interrupter protection?GFCI (Ground Fault Circuit Interrupter) protection should be provided for every receptacle outlet and motor connection in every location where someone might be and the environment might be wet, moist or damp. Yes, that means everywhere in a bathroom, all the countertop outlets in the kitchen, and within six feet of the sink in the wet bar. It also means everywhere outside and all of the electrical circuits associated with your swimming pool, spa, hot tub, or hydro-massage tub, even if these are indoors.

There are four more locations for GFCI that might not be as obvious: a boathouse, a garage, an unfinished basement and a crawl space. If you're trying to find the location of a GFCI that you suspect is responsible for a dead receptacle somewhere else, you should check in those places.